Astrophotography by Anthony Ayiomamitis

Sharpless Catalog Nebula Image Gallery

The Sharpless catalog of emission nebulae contains 313 entries representing H-II emission nebulae with a declination of -27 degrees or above. Compiled and published by American astronomer Stewart Sharpless (USNO) in 1959 (see here), the catalog contains a wide variety of star formation regions across the Milky Way including various Herbig-Haro and Wolf-Rayet objects as well as a number of well-known emission nebulae such as the Trifid (M20), the Eagle (M16), Orion (M42), Lagoon (M8), the Crescent (NGC 6888), and the Crab (M1) nebula.

Note: The large and bright emission nebula Sh2-157 in Cassiopeia (near the northern border with Cepheus) lies 8,150 light-years away and spans another 215 light-years across. Sh2-157 is described as a ring nebula surrounding the Wolf-Rayet star WR 157 (SAO 20512, mag 9.58) and is in the immediate vicinity of both the open cluster M52 as well as the stunning Bubble Emission Nebula. Also visible in the field of view of the image below is the small open cluster NGC 7510 at the top right quadrant which is comprised of approximately 100 member stars, is well-detached from the background and is relatively bright at mag 7.9. Similarly, the bottom right quadrant has the small elliptical planetary nebula PLN 110-0.1 (aka WeSb 6, RA: 23h 12m 12s, Dec: +59°36'02") with an apparent diameter of two arc-minutes.

Please click on the image below to display in higher resolution (1200 x 900)

Image Details
Sh2-157 - Emission Nebula in Cassiopeia
Imaging Details
Sharpless Number:
2-157

Common Name(s):
N/A

Other Designations:
LBN 537

Object Type:
Bright Nebula

Object Classif:
E Ir F

Constellation:
Cassiopeia

RA / Dec:
23h 16m 08s /
60° 02' 29"


Distance:
8,154 light-yrs

Object Size:
N/A

Magnitude:
N/A


Date:
Jul 31-Aug 1, 2010
22:20 - 05:10 UT+3


Location:
Athens, Greece

Equipment:
Takahashi FSQ-106/f5
AP 1200GTO GEM
SBIG ST-10XME
SBIG CFW10
Baader 7 nm Ha
SBIG LRGB filters


Integrations:
Lum (H-a) :  240 min (12 x 20 min)
Red :  050 min (05 x 10 min)
Green :  050 min (05 x 10 min)
Blue :  050 min (05 x 10 min)
Binning :  1x1 (Lum),  1x1 (RGB)

Image Scale:
2.65" per pixel

Temperatures:
Ambient : + 21.4 ° C
CCD Chip : - 12.5 ° C

Software:
CCDSoft V5.00.195
CCDStack V1.6.0.5
eXcalibrator V1.0.3.0
Aladin V6
GradientXTerminator
Photoshop CS2